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Sigma Capricorni

Star in the constellation Capricornus

Sigma Capricorni

Location of σ Capricorni (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Capricornus
Right ascension	20h19m 23.60402s[1]
Declination	−19° 07′ 06.6967″[1]
Apparent magnitude (V)	+5.31[2]
Characteristics
Spectral type	K2 III[3]
U−B color index	+1.56[2]
B−V color index	+1.43[2]
Astrometry
Radial velocity (Rv)	−9.64±0.16[1] km/s
Proper motion (μ)	RA: +8.07[4] mas/yr Dec.: −11.31[4] mas/yr
Parallax (π)	3.0609 ± 0.1194 mas[1]
Distance	1,070 ± 40 ly (330 ± 10 pc)
Absolute magnitude (MV)	−2.38[5]
Details
Mass	6.3±0.7[6] M☉
Radius	67.5+4.2 −6.0[1] R☉
Luminosity	1,392±64[1] L☉
Temperature	4292+204 −127[1] K
Age	60.5±17.2[6] Myr
Other designations
σ Cap, CD−19°5776, FK5 3625, HD 193150, HIP 100195, HR 7761, SAO 163445, WDS J20194-1907A[7]
Database references
SIMBAD	data

Sigma Capricorni, Latinized from σ Capricorni, is a solitary^[8] star in the southern constellationofCapricornus,^[7] 0.5 degree north of the ecliptic. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of +5.31.^[2] The star is about 1,070 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −9.6 km/s.^[1]

This object is an evolved, K-type giant star with a stellar classification of K2 III.^[3] Having exhausted the supply of hydrogen at its core, it has expanded and now has around 67.5^[1] times the girth of the Sun. The star is about 60.5^[6] million years old with 6.3^[6] times the mass of the Sun. It is radiating 1,392^[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,292 K.^[1]

A magnitude 9.43 visual companion is at an angular separationof55.90″ along a position angle of 179°, as of 2016.^[9]

References[edit]